Countries with the lowest historical emissions experienced three to four times higher than seasonal temperatures this June-August days than G20 countries, according to an analysis conducted by an independent U.S.-based group of scientists using a metric called the Climate Shift Index (CSI).
The three-month June-August 2023 season was the warmest on record globally and the analysis by Climate Central indicates that human-caused climate change made the unprecedented heat far more likely across the globe.
CSI measures how often and how much temperatures have shifted from the historical average. A higher index indicates more dramatic changes compared to the past.
